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Author/Creator
- Geological Survey (U.S.)5
- Carter, Janet M.1
- Chester County (Pa.). Health Department1
- Chester County Water Resources Authority1
- Driscoll, Daniel G.1
- Gannett, Marshall W.1
- Hamlin, Scott N.1
- Hippe, Daniel J.1
- Lite, Kenneth E.1
- Low, Dennis J. (Dennis James)1
- National Water-Quality Assessment Program (U.S.)1
- Nevada. Department of Conservation and Natural Resources1
- Oregon. Water Resources Department1
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Plume, Russell W.1
- Sawyer, J. Foster1
- Sloto, Ronald A.1
- South Dakota. Department of Environment and Natural Resources1
- United States. Bureau of Reclamation1
- West Dakota Water Development District (S.D.)1